Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é 2001, quando 1987 é N/A e quando Career SR é N/A?
 ###Tabelas: CREATE TABLE rank_by_number_of_wins (rank_by_number_of_wins_id AUTO_INCREMENT PRIMARY KEY, City & Nation VARCHAR, First Place INT, Second Place INT, Third Place INT, Total Top 3 Placements INT, First Place Winning Year(s) (if applicable) VARCHAR) CREATE TABLE doubles_performance_timeline (doubles_performance_timeline_id AUTO_INCREMENT PRIMARY KEY, Tournament VARCHAR, 1987 VARCHAR, 1988 VARCHAR, 1989 VARCHAR, 1990 VARCHAR, 1991 VARCHAR, 1992 VARCHAR, 1993 VARCHAR, 1994 VARCHAR, 1995 VARCHAR, 1996 VARCHAR, 1997 VARCHAR, 1998 VARCHAR, 1999 VARCHAR, 2000 VARCHAR, 2001 VARCHAR, 2002 VARCHAR, 2003 VARCHAR, Career SR VARCHAR, Career Win-Loss VARCHAR) CREATE TABLE sport (sport_id AUTO_INCREMENT PRIMARY KEY, N° INT, Television service VARCHAR, Country VARCHAR, Language VARCHAR, Content VARCHAR, DAR VARCHAR, HDTV VARCHAR, PPV VARCHAR, Package/Option VARCHAR) CREATE TABLE house_of_representatives (house_of_representatives_id AUTO_INCREMENT PRIMARY KEY, District VARCHAR, Representative VARCHAR, Party Change? VARCHAR, Prior background VARCHAR, Religion VARCHAR, Birth year INT) CREATE TABLE major_league_soccer (major_league_soccer_id AUTO_INCREMENT PRIMARY KEY, Metropolitan Area VARCHAR, Media Market Ranking INT, Since INT, MLB Team(s) VARCHAR, NBA Team(s) VARCHAR)  
SELECT 2001 FROM doubles_performance_timeline WHERE 1987 = n/a AND Career SR = n/a